单项选择题

This is an exciting area of study, and one ______ which new applications are being discovered almost daily.

A．from
B．by
C．in
D．through
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单项选择题
As teachers we should concern ourselves with what is said, not what we think ______.
A．ought to be said
B．must say
C．have to be said
D．need to say
单项选择题
I didn't send out my application form last week, but I
A．had to
B．would do
C．should have
D．might have to
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